Returns an array of ad requests.

getAdRequests.js

/**
 * Returns an array of ad requests. Requires modern browsers.
 * [{
 *   correlator: '1978064853149162',
 *   pageTargeting: {
 *     key1: 'val1',
 *     key2: 'val2',
 *   },
 *   slots: [{
 *     sizes: [
 *       '300X250',
 *       '300X600'
 *     ],
 *     targeting: {
 *       key1: 'val1',
 *       key2: 'val2',
 *     }
 *   }]
 * }]
 */
function getAdRequests() {
  function getUrlParams(search) {
      let hashes = search.name.slice(search.name.indexOf('?') + 1)
        .split('&').filter(item => {
          return /^correlator|^prev_iu_szs|^prev_scp|^cust_params/.test(item);
        });
      let params = {}
      hashes.map(hash => {
          let [key, val] = hash.split('=')
          params[key] = decodeURIComponent(val)
      })
      return params
  }

  function arrayToObject(obj, entry) {
    obj[entry[0]] = entry[1];
    return obj;
  }

  return performance.getEntries()
    .filter(entry => {
      return /pubads.g.doubleclick.net\/gampad\/ads/.test(entry.name);
    })
    .map(getUrlParams)
    .map(entry => {
      const slots = [];
      entry.prev_iu_szs.split(',').forEach(slot => {
        slots.push({sizes: slot.split('|')});
      })
      return Object.assign(entry, {slots: slots });
    })
    .map(entry => {
      const slots = [];
      (entry.prev_scp.split('|') || []).forEach(slot => {
        slot = (slot.split('&') || []).map(el => el.split('='))
        .reduce(arrayToObject, {}),
        slots.push(slot);
      });
      entry.slots.forEach((slot, i) => {
        slot.targeting = slots[i];
      });
      return {
        correlator: entry.correlator, 
        pageTargeting: (entry.cust_params && entry.cust_params.split('&') || [])
          .map(entry => entry.split('='))
          .reduce(arrayToObject, {}),
        slots: entry.slots
      };
    });
}